Self-locking nut.



V J. PEARSON.

SELF LOUKINGNUT.

APPLIUATION mum MAY 13, 1907 991$ 68, Patanted May 2, 1911.

QUNITED STATES PATENT OFFICE.

JOHN PEARSON, or cHIcAeo', ILLINOIS, ASSIGNOR TO GRIP nor ooMrAnY, or

- CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS,

SELF-LOCKING NUT.

Specification of Letters Patent. Application filed May 13, 1907. Serial No. 373,334.

Patented May 2, 1911.

- provements in Self-Locking Nuts, of which the following is a des'cription.

My invention relates to that class of nuts provided with means for automatlcally engagingthe bolt upon which theyare mounted to prevent their accidentah displacement when in use. I

Theobject of my invention is to produce a simple, and efiicient device of the kind described, and one which may be repeatedly used upon a bolt or the like without damage to the bolt or nut or without destroying its holding qualities.

To this end myinvention consists in. the novel construction, arrangement, and combination of parts herein shown and described, and more particularly,pointed out in the claim.

In the accompanying drawings wherein like or similar reference characters indicate like or corresponding parts; Figure l is a side elevation of a nut blank for forming my improved nut lock. Fig. 2 is a central vertical section of the same threaded. F ig. 3 is a section similar to that-shown in Fig. 2, but showing the finished nut. section taken substantially on line H of Fig. 2. Fig. 5 is a section similar'to Fig. 3

showing a slightly modified form of my device. I

In the preferred form shown in the drawings, my device comprises a threaded nut 1 of the usual or any preferred form in which the wall of the threaded opening is divided into two sections, comprising a holding ornormal section 2 and a locklng section 3.

'The nut 1 is preferably formed integral with the adjacent parts of the sections 2 and 3 slightly separated to insure an absolutelyfree faction of the locking portion and also to facilitate the manufacture of the nut.

The division between the sections of the nut may be secured in any desired manner.

Fig. at is a The nut blank thus formed is threaded. in the usual manner or any desired manner after which thethreads of the locking section 3 are slightly bent or otherwise uniformly displaced from their normal position long-it-udinally of the opening so that when a bolt havingnormal threads is inserted in the nut the threads of the section 3 owing to their longitudinal distortion will grip the threads of the bolt and tend to prevent accid'entah displacement-or movement between the bolt and nut.

' "The displacement of the threads of the part 3 may be produced in any desired manner. In the form shown in Figs. 1, 2 and 3 the slot 4 is formed slightly higher at its center, and a swell or projection 5 is provided at the back of the nut and extending parallel with the slot as shown in Fig. 2. After the blank is threaded sufficient pres- .sure is applied to the projection 5 at one or both sides of the threaded opening to permanently bend the same toward the nut partially closing the slot, leaving the back face of the nut flat as shown in Fig. 3, and bending all the threzfds of the section 3 from their normal or original form longitudinally of the threaded opening, as shown by the broken lines in Fig. 3, which indicate the original form of the threads'in this part.

In Fig. 5 the nut is formed as. before described except that the projection 5 may be,

omitted and the slot 4 may be of uniform height. To displace the threads of the look ing portion in. this form pressure is applied upon the edges of the nut to upset the material at one or both edges of the slot 4 thus slightly decreasing the height of the slot either uniformly or at one edge as the case may be and slightly displacing the threads of the locking portion of the nut .so that when a bolt is inserted through the part 2 into the part 3' the threads of the two parts of the nut will ,cooperate to lock the bolt from movement in the nut.

While in the foregoing description in each form I have referred to the displacement of the part 3 toward the part 2 it is obvious that a displacement in the opposite direction would operate in a very similar manner al though such a displacement is probably slightly more diflicult to secure. Obviously this and other slight modifications may be made in my device without departing from the spirit of my invention, henceI do not wish to be understood as limiting myself to the exact form and construction shown.

WhatAI claim as new, and desire to secure by Letters Patent is p A nut comprising a body part with an annularthreaded opening, the body part having a transversely extending opening of a width slightly in excess of the width of the threaded opening and separating the nut into a holding part and a locking part, the

wall of the annular threaded opening being otherwise continuous, the threads of the holding part being continuous and uninterrupted and a portion of each of the threads of the locking part being distorted whereby the pitch of the successive threads of the locking part along any one line of its openingare uniform all along said line but .vary from the normal pitch at one line of said opening.

In testimony whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

JOHN PEARSON.

\Vitnesses:

BURTON U. HILLS, CHARLES I. COBB. 

